Yikes, I don't think adding an appointment to a cart would make sense at all.
I wonder if there should be a "Payment Gateways" plugin, which integrates with marketpress and appointments+ and other plugins which may require payments, that way we can use the different gateways with different plugins "that may need payments" and don't have to do things like adding an appointment to a cart, which clearly wouldn't make sense.
Could you possibly move this post here, to the feature requests?
I look at wpmudev to accomplish things without the need to hire a developer, I can't afford that. I feel thats why most people here probably join wpmudev.

Hi, how does the Luke & Sarah Demo put the button on top of the video? I'm trying to accomplish something similar with a button just like that, and text above it.
It seems in the demo that there should be a way to place an element on top of an element, maybe I'm wording it wrong.

The site is muahub.com
It continues for me, and I just on "another device" however it was too a Galaxy s5... and it is also not functioning properly on that phone either.
Both devices were using the Chrome Browser App (actual phones, not developer consoles)
Thanks!